ET 26202

When are several motors permitted to be supplied by a single branch circuit?

• the tap is at least 30' (9m) long

• each motor is no larger than 1hp

• it is part of a field fabricated assembly

• the system voltage is greater than 1,000v

Over what size motor needs an integral thermal protector to de-energize the motor?

• 100hp

• 500hp

• 1,000hp

• 1,500hp

Answer explanation

Level 2) pg. 127

What does NEC Article 430 cover?

• the application and installation of luminaires

• general information on grounding and bounding

• provisions for transformers

• the application and installation of motors

Answer explanation

Level 2) pg. 122

What is the approximate horsepower of a 12,000W DC motor?

• 12hp

• 14hp

• 16hp

• 25hp

Answer explanation

Horsepower= Watts/746

12,000/746= 16hp

Which of the following DC motors is used to provide high starting torque and constant speed under load?

• shunt

• series

• brushless

• compound

Answer explanation

Level 2) pg. 71

Which of the following occurs when a single-loop DC motor is placed in the neutral plane?

• no torque is produced

• the motors becomes self-starting

• the commutator connects to the brushes

• maximum torque is produced

Answer explanation

Level 2) pg. 62

Which of the following motors is the BEST choice for providing excellent speed control?

• shunt DC

• split-phase AC

• synchronous AC

• series DC

Answer explanation

Level 2) pg. 70

What is the D dimension of a medium-size that has a frame number 166T?

• 2"

• 4"

• 6"

• 8"

Answer explanation

Level 2) pg. 110

According to NEMA, which of the following is a type of open motor?

• fan cooled

• nonventilated

• explosion proof

• weather protected

Answer explanation

Level 2) pg. 106

What is an open motor type that incorporates a separate motor-driven blower mounted on the enclosure?

• air cooled

• nonventilated

• pipe-ventilated

• externally ventilated

Answer explanation

Level 2) pg. 107